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United States Patent |
6,135,150
|
Powell
,   et al.
|
October 24, 2000
|
Valve assembly
Abstract
A valve assembly used to minimize chemical loss during the transfer of
chemicals from one container to another is disclosed herein. The valve
assembly minimizes chlorine or other process material loss to the
environment by sealing the manifold and the cylinder to be filled from the
environment while the valve assembly is connected or disconnected. The
valve assembly includes an inlet valve connectable to an outlet valve, the
inlet valve comprising a first plug positioned in a bore extending between
an inlet and outlet port and a transfer tube engaging a bore of a first
insert positionable within the bore of the inlet valve. The outlet valve
comprises a second plug positioned in a bore extending between an inlet
and outlet port and second insert positionable within the bore of the
outlet valve. The transfer tube has a first and second end configured to
be insertable at least partially within respective bores of the first and
second inserts, the first and second ends each having at least one port. A
bore extends through the transfer tube to allow fluid communication
between the first and second ends.
Inventors:
|
Powell; Jonathan S. (Mariposa, CA);
Modesett; Dean (Mariposa, CA)
|
Assignee:
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Powell Engineering Co., Inc. (Mariposa, CA)
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Appl. No.:
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428875 |
Filed:
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October 28, 1999 |
Current U.S. Class: |
137/614.04; 137/614.03 |
Intern'l Class: |
F16L 037/28 |
Field of Search: |
137/614.04,614.02,614.03,614.05
|
References Cited
U.S. Patent Documents
2864628 | Dec., 1958 | Edleson | 137/614.
|
3409045 | Nov., 1968 | Mackey et al. | 137/614.
|
4082112 | Apr., 1978 | Schmidt | 137/614.
|
4084614 | Apr., 1978 | Ekman | 137/614.
|
4770207 | Sep., 1988 | Hofmann | 137/614.
|
6032691 | Mar., 2000 | Powell et al. | 137/614.
|
Primary Examiner: Lee; Kevin
Attorney, Agent or Firm: Kiesel; William David, Ford; R. Bennett
Parent Case Text
PRIORITY
This application is a continuation of application Ser. No. 09/280,095 filed
on Mar. 29, 1999 now U.S. Pat. No. 6,032,691.
Claims
We claim:
1. A valve assembly comprising:
(a) an inlet valve configured to engage an outlet valve and a receptacle
for holding process material, said inlet valve comprising:
(i) a first end configured to have an inlet port;
(ii) a second end configured to have an outlet port;
(iii) a bore extending between said inlet port and said outlet port;
(iv) a first plug movably positioned in said bore, said first plug having
an open and a closed position, said first plug biased in a closed
position, said first plug sealing said inlet port from said outlet port
when in a closed position;
(v) a first insert positionable within said bore of said inlet valve, said
first insert having a seat end and a face end, said seat end engaging said
inlet plug when said inlet plug is in a closed position, said first insert
having a bore extending therethrough to allow fluid communication between
said inlet port and said outlet port of said inlet valve;
(b) an outlet valve configured to engage said inlet valve and a source of
process material, said outlet valve comprising:
(i) a first end configured to have an inlet port;
(ii) a second end configured to have an outlet port;
(iii) a bore extending between said inlet port of said outlet valve and
said outlet port of said outlet valve; and,
(iv) a second plug movably positioned in said bore, said second plug having
an open and a closed position, said second plug biased in a closed
position, said second plug sealing said inlet port of said outlet valve
from said outlet port of said outlet valve when in a closed position;
(v) a second insert positionable within said bore of said outlet valve,
said second insert having a seat end and a face end, said seat end
engaging said outlet plug when said outlet plug is in a closed position,
said second insert having a bore extending therethrough to allow fluid
communication between said inlet port and said outlet port of said outlet
valve; and,
(c) a transfer tube comprising:
(i) a first end configured to be insertable at least partially within said
bore of said first insert, said first end of said transfer tube configured
to have at least one port;
(ii) a second end slidably positioned at least partially in said bore of
said second insert, said second end of said transfer tube configured to
have at least one port; and,
(iii) a bore extending through said transfer tube, said bore allowing fluid
communication between said at least one port in said first end of said
transfer tube and said at least one port in said second end of said
transfer tube.
2. The valve assembly according to claim 1 further comprising a first
spring positioned within said bore of said inlet valve so that said first
spring biases said first plug in a closed position.
3. The valve assembly according to claim 2 further comprising a second
spring positioned within said bore of said outlet valve so that said
second spring biases said second plug in a closed position.
4. The valve assembly according to claim 3 wherein a spring constant of
said second spring is greater than a spring constant of said first spring.
5. The valve assembly according to claim 4 further comprising at least one
seal adapted to form a seal between a transfer tube and said bore of said
first insert when said transfer tube engages said bore of said first
insert.
6. The valve assembly according to claim 5 further comprising at least one
seal adapted to form a seal between said transfer tube and said bore of
said second insert.
7. The valve assembly according to claim 6 further comprising a coupler
adapted to join said inlet valve and said outlet valve.
8. The valve assembly according to claim 7 wherein said coupler is
rotatably mounted on said outlet valve.
9. The valve assembly according to claim 8 wherein said transfer tube
further comprises at least one sealing member positioned thereon, said
sealing member forming a seal between said transfer tube and said first
insert when said transfer tube engages said bore of said first insert.
10. The valve assembly according to claim 1 further comprising at least one
seal adapted to form a seal between a transfer tube and said bore of said
first insert when said transfer tube engages said bore of said first
insert.
11. The valve assembly according to claim 1 further comprising at least one
seal adapted to form a seal between said transfer tube and said bore of
said second insert.
12. The valve assembly according to claim 1 further comprising a coupler
adapted to join said inlet valve and said outlet valve.
13. The valve assembly according to claim 1 wherein said coupler is
rotatably mounted on said outlet valve.
14. The valve assembly according to claim 1 wherein said transfer tube
further comprises at least one sealing member positioned thereon, said
sealing member forming a seal between said transfer tube and said first
insert when said transfer tube engages said bore of said first insert.
15. A valve assembly comprising:
(a) an inlet valve configured to engage an outlet valve and a receptacle
for holding process material, said inlet valve comprising:
(i) an inlet, an outlet and a bore extending between said inlet and said
outlet,
(ii) a first plug movably positioned in said bore, said first plug having
an open and a closed position, said first plug biased in a closed
position, said first plug sealing said inlet from said outlet when in a
closed position;
(iii) a first insert positionable within said bore of said inlet valve,
said first insert having a bore extending therethrough to allow fluid
communication between said inlet and said outlet of said inlet valve;
(b) an outlet valve configured to engage said inlet valve and a source of
process material, said outlet valve comprising:
(i) an inlet, an outlet and a bore extending between said inlet and said
outlet,
(ii) a second plug movably positioned in said bore of said outlet valve,
said second plug having an open and a closed position, said first plug
biased in a closed position, said second plug sealing said inlet from said
outlet when in a closed position;
(vi) a second insert positionable within said bore of said outlet valve,
said second insert having a bore extending therethrough to allow fluid
communication between said inlet and said outlet of said outlet valve;
and,
(ci) a transfer tube comprising:
(iv) a first end configured to be insertable at least partially within said
inlet valve;
(v) a second end configured to be insertable at least partially within said
outlet valve; and,
(vi) a bore extending between said first end and said second end of said
transfer tube to allow fluid communication between said ends of said
transfer tube,
wherein said transfer tube allows fluid communication between said inlet
and said outlet valve when said inlet valve and said outlet valve are
engaged.
16. The valve assembly according to claim 15 further comprising a first
spring positioned within said bore of said inlet valve so that said first
spring biases said first plug in a closed position.
17. The valve assembly according to claim 16 further comprising a second
spring positioned within said bore of said outlet valve so that said
second spring biases said second plug in a closed position.
18. The valve assembly according to claim 17 wherein a spring constant of
said second spring is greater than a spring constant of said first spring.
19. The valve assembly according to claim 18 further comprising at least
one seal adapted to form a seal between a transfer tube and said bore of
said first insert when said transfer tube engages said bore of said first
insert.
20. The valve assembly according to claim 19 further comprising at least
one seal adapted to form a seal between said transfer tube and said bore
of said second insert.
21. The valve assembly according to claim 20 further comprising a coupler
adapted to join said inlet valve and said outlet valve.
22. The valve assembly according to claim 21 wherein said coupler is
rotatably mounted on said outlet valve.
23. The valve assembly according to claim 22 wherein said transfer tube
further comprises at least one sealing member positioned thereon, said
sealing member forming a seal between said transfer tube and said first
insert when said transfer tube engages said bore of said first insert.
24. The valve assembly according to claim 15 further comprising at least
one seal adapted to form a seal between a transfer tube and said bore of
said first insert when said transfer tube engages said bore of said first
insert.
25. The valve assembly according to claim 15 further comprising at least
one seal adapted to form a seal between said transfer tube and said bore
of said second insert.
26. The valve assembly according to claim 15 further comprising a coupler
adapted to join said inlet valve and said outlet valve.
27. The valve assembly according to claim 15 wherein said coupler is
rotatably mounted on said outlet valve.
28. The valve assembly according to claim 15 wherein said transfer tube
further comprises at least one sealing member positioned thereon, said
sealing member forming a seal between said transfer tube and said first
insert when said transfer tube engages said bore of said first insert.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a valve assembly for filling gas cylinders, more
particularly a valve assembly that reduces the amount of gas wasted during
the filling process.
2. Prior Art
During tank filling processes when toxic or hazardous chemicals are being
transferred into smaller cylinders, chemical loss occurs when the
cylinders are connected to and disconnected from the manifold because the
chemical sometimes remains in the lines that connect the manifold and the
cylinders and leaks to the environment. This chemical loss is a health
risk to both the operator and to the surrounding areas. Thus, a need
exists for a valve connection that can minimize this chemical loss.
Several devices have been developed in the past, but none of these devices
efficiently meets these concerns. An example of a prior art device is
shown in U.S. Pat. No. 5,379,793. A need exists for an improved valve
assembly that can decrease chemical loss every time a tank is filled while
at the same time increasing the safety of the operators.
OBJECTS AND ADVANTAGES OF THE INVENTION
The design of the present valve assembly of this invention reduces chemical
loss at the cylinder connections by sealing both the cylinder and the
manifold from the environment when the cylinders are connected to and
disconnected from the manifold. Thus, the chemical loss is decreased and
safety of the operators in increased.
With the aforementioned considerations in mind, it is therefore an object
of this invention to provide a safe and efficient apparatus and method for
filling tanks and cylinders.
It is a further object of this invention to provide a tank filling
apparatus that includes a valve assembly connected between the manifold
and the cylinders that substantially minimizes process material loss to
the environment.
It is a further object of this invention to provide a valve assembly
connected between the manifold and the cylinders that can reduces the
health risks associated with operating a tank filling system where toxic
or hazardous materials are being transferred through the apparatus.
These and other advantages and objects of this invention shall become
apparent from the ensuing description of the invention.
SUMMARY OF THE INVENTION
A valve assembly may be used in connection with a tank filling apparatus,
or in connection with other apparatus or methods. The valve assembly
comprises an inlet valve connectable to an outlet valve having a first end
adapted to engage a receptacle for holding process material and configured
to have an inlet port; a second end adapted to engage said second end of
an outlet valve and configured to have an outlet port; a bore extending
between the inlet and outlet ports; and, a first plug movably positioned
in the bore, having an open and a closed position, and sealing the inlet
port from the outlet port when in the closed position. The valve assembly
further comprises an outlet valve having a first end adapted to engage a
source of process material and configured to have an inlet port; a second
end adapted to engage the inlet valve and configured to have an outlet
port; a bore extending between the inlet and outlet ports; and, a second
plug movably positioned in the bore, having an open and a closed position,
and sealing the inlet port from the outlet port when in the closed
position. The valve assembly also comprises a transfer tube having a first
end configured to be insertable into the inlet valve bore and configured
to have at least one port; a second end configured to be insertable into
the outlet valve bore and configured to have at least one port; and, a
bore extending through the transfer tube, allowing fluid communication
between the ports.
The valve assembly may further comprise inserts positionable within the
bores of the inlet or outlet valves. The inserts have bores extending
therethrough to allow fluid communication between the ends thereof which
are configured with one or more ports. In such embodiments, the ends of
the transfer tube are configured to be insertable into the bores of the
inserts.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1a illustrates a cross-sectional view of a preferred embodiment of a
valve used with the invention to connect the manifold to a cylinder.
FIG. 1b illustrates the transfer tube used to transport process material
between the valve bodies of the valve assembly that operatively connects
the manifold to the cylinders.
FIG. 1c illustrates a fitting used to transfer process material from a
cylinder having an inlet valve attached thereto.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
Illustrations of preferred construction, design, and methods of operation
of the invention are set forth below with specific references to the
Figure. However, it is not the intention of the inventor that the scope of
his invention be limited to these preferred embodiments.
As shown in FIG. 1a, valve assembly 116 comprises an inlet valve 201
connectable to an outlet valve 202. Valves 201, 202 may be connected
directly to each other using threaded or other connections, such as a
coupler 203. Coupler 203 is rotatably mounted to outlet valve 202 using a
shoulder and snap ring assembly, or any other suitable assembly for
connecting coupler 203 to outlet valve 202. Each valve 201, 202 is
constructed similar to a spring-loaded ball or plug check valve having a
plug or ball positioned within the bores 235, 236 of respective valves
201, 202.
Inlet valve 201 is configured with inlet port 206 and an outlet port 222
with bore 235 extending therebetween. First end 204 of inlet valve 201 is
configured with threads 207 that mate with opposing threads on cylinder
117 or other receptacle for holding a process material. Positioned on the
outer surface of inlet valve 201 at second end 234 are threads 211 that
mate with corresponding threads 212 on coupler 203 or other connection
member on outlet valve 202. Positioned within bore 235 is first spring 215
operatively positioned or mounted therein so that first plug 216 seals
against seat 217 when at rest, thereby sealing inlet port 206 from outlet
port 222. Seats 217 may be constructed from suitable o-rings.
Outlet valve 202 is configured with an outlet port 237 and inlet port 221
with bore 236 extending therebetween. First end 205 may be configured with
threads 208 which mate with opposing threads on a source material manifold
or with opposing threads on other process material containers. Positioned
within bore 236 is second spring 220 operatively positioned or mounted
therein so that second plug 219 rests against seat 218 when in a closed
position, thereby sealing inlet port 221 from outlet port 237.
Transfer tube 230 is a cylindrical member having ends that are configured
to slidingly insert into the bores 235, 236 of valves 201, 202 through
ports 222, 237 (or bores 243, 253 of inserts 240, 250). Transfer tube 230
is configured with a bore 239 therein extending axially through transfer
tube 230 between ends 224, 225. Transfer tube 230 is configured with one
or more ports 231, 232 that allow fluid to flow around the respective
plugs 216,219 when ends 224, 225 engage plugs 216,219. Ports 231, 232 may
be configured to be apertures, such as circular holes. An o-ring seal 213
may be positioned around the outer walls of transfer tube 230 so that when
tube 230 engages bore 235 (or bore 243), seal 213 seals bore 235 (or bore
243).
Although not required, as shown in FIG. 2a, valve assembly 116 may further
comprise first and second inserts 240, 250, positioned within bores 235,
236 so that transfer tube 230 may slidingly engage first and second
inserts 240, 250. Each insert 240, 250 has a face end 241, 251 and a seat
end 242, 252 with a bore 243, 253 extending therebetween. An o-ring seal
244, 254 may be positioned along the walls of bores 243, 253 to provide
additional seal protection when in operation. Additional o-ring seals 245,
255 may be positioned between the respective inserts 240, 250 and valve
201, 202 for additional seal protection. Inserts 240, 250 have shoulders
246, 256 along seat end 242, 252 that allow o-rings 247, 257 to form seats
217, 218 upon which plugs 216, 219 rest in a closed position. In
embodiments with inserts 240, 250, outlet ports 222, 237 are defined by
the inner walls of inserts 240, 250.
If no inserts 240, 250 are used, the body of valves 201, 202 fills the area
otherwise occupied by inserts 240, 250. Seals 244, 254 are then positioned
in the same approximate area along bores 235, 236 that seals 244, 254 are
positioned within bores 243, 253 so that transfer tube 230 sealingly and
slidably engages the walls of bores 235, 236.
Inlet and outlet valves 201, 202 are preferably constructed from brass or
other suitable material that is corrosion resistant to the process
material flowing through the valve. The seals used in valve assembly 116
are preferably o-rings constructed from VITON, a synthetic rubber material
available from E.I. DuPont De Nemours & Co., Inc. of Wilmington, Del.
Inserts 240, 250 are preferaby constructed from KYNAR, available from
Pennwalt Corp. of Philadelphia, Pa. Springs 215, 220 are constructed from
a corrosion resistant material, preferably HASTELLOY.
During the cylinder filling process, valve assembly 116 operates as
follows. Inlet valve 201 is securely connected to a cylinder to be filled.
Next, outlet valve 202 is securely connected to a connection line or port
attached to the source container containing the material to be
transported. Next, outlet valve 202 is positioned over inlet valve second
end 234 so that coupler threads 212 engage corresponding threads 211 on
inlet valve 201. Coupler 203 is rotated so that inlet and outlet valves
201, 202 are forced toward each other. As this occurs, transfer tube 230
inserts into inlet port 206, passing seals 244 and forming a sealed
connection between the outer walls of transfer tube 230 and either the
walls of bore 235 or the walls of insert 240. As coupler 203 is further
rotated, transfer tube end 224 engages and abuts first plug 216, and
o-ring 213 abuts face 241, preventing transfer tube 230 from moving any
further into inlet valve 201 and forcing end 225 to abut and exert
pressure on plug 219. As coupler 203 continues to rotate, transfer tube
ends 224, 225 exert additional pressure against plugs 216, 219 until plugs
216, 219 disengage seats 217, 218.
First spring 215 has a spring constant less than the spring constant for
second spring 220. Thus, first plug 216 disengages seat 217 before the
additional force required to displace second plug 219 from seat 218 is
exerted. When enough force has been applied to springs 215, 220 to
displace both plugs 216, 219, chlorine flows from connection line 115,
through port 221 into bore 236 (or into bore 254 and then into bore 236)
through transfer tube bore 239, into bore 235 (or into bore 244 and then
into bore 235) through port 222 and into the cylinder to be filled.
When the cylinder is filled, coupler 203 is rotated in an opposite
direction until coupler 203 disengages inlet valve 201. As this occurs,
the action of transfer tube 230 is reversed: second plug 219 seals against
seat 218, sealing the connection lines or port from the environment, and
first plug 216 seals against seat 217, sealing the filled cylinder from
the environment. As second plug 219 seals against seat 218, the vapor
pressure within transfer tube bore 239 equalizes to the vapor pressure
within the cylinder causing any liquid within bore 239 to flash before
plug 216 seats against seat 217. The phase change decreases the amount of
process material within bore 239 because gasses occupy a greater volume
due to a decreased density. Thus, less process material is present within
bore 239. Process material (chlorine) loss is limited to the amount of
material contained within transfer tube bore 239. In a preferred
embodiment, transfer tube 230 is about 7/8 inches long and bore 239 has an
inside diameter of about 3/16 inches--about 0.024 in..sup.3 Thus, each
time a cylinder is filled, minimal losses of chlorine occur.
Inlet valve 201 may be connected to the standard intake valves 170 on
cylinders 117 each time the cylinders are filled, but preferably cylinders
117 are retrofitted so that inlet valve 201 is attached to intake valve
170. Where the cylinder 117 has an inlet valve 201 connected to intake
valve 170 or retrofitted as a part thereof, a fitting 400 may be attached
thereto to allow transport from the cylinder 117 as shown in FIG. 2c.
Fitting 400 is similar to outlet valve 202, but comprises a coupler 401
engageable with opposing threads 211 on inlet valve 201 and having an
insert 402 positioned therein with a wand 403 that unseats plug 215
allowing flow through a bore 404 in insert 402 and into the device,
apparatus, or process to which fitting 400 is attached. By controlling the
number of turns coupler 401 makes when engaging inlet valve 201, a user
can control the amount of process material flowing through fitting 400.
More turns of coupler 401 will open plug 216 further, increasing flow
through valve 201 and fitting 400, and vice versa.
While this invention has been described in terms of a preferred embodiment
for use with chlorine, other liquids or gases may be processed in
accordance with the apparatus and method described herein, and this
invention is not limited to chlorine processing. Additionally, although
threaded connections have been described herein for the cylinder valve
components, other types of connections well-known in the art could also be
used. Furthermore, the scope of this invention is intended to include its
adaptation for use in a variety of ways where process material is
transported from one container to another.
Although the preferred embodiment has been described, it will be
appreciated by those skilled in the art to which the present invention
pertains that modifications, changes, and improvements may be made without
departing from the spirit of the invention defined by the claims.
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